Let-off mechanism for looms



(No Model.)

, P.OTT.

LET-OFF MECHANISM FOR LOOMS.

No. 392,284. Patented Nov. 6, 1888; I

WITNESSES: INVENTOR I QMM LK 7H: NuRms PETERS 00.. PHOTO-LITHOQWASHINGTON, u. c:

U ITED STATES PATENT ()FFICE.

F tEDERIOK OTT, OF GLOUCESTER CITY, NEW JERSEY.

LET-OFF MECHANlSM FOR LOOMS.

EPECIPICATION forming part of Letters Patent No. 392,284, dated November6, 1888.

Application filed February 26, 1887. Serial No. 228,920. (No modeLl.

To all whom iv may concern:

Be it known that l. FREDERICK Orr, a citizen of Germany, residing atGloucester City, State of New Jersey, have invented certain new anduseful Improvements in Let-Off Meolr anisms for Looms; and I dohcrebydeclare that the following is a full, clear, and exact description of myinvention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention has reference to looms used for weaving what are calledcrinkles or crinkled fabrics. In order to produce these it is necessarythat some of the warpthreads should be let off faster than others.

My invention consists more especially in mechanism for accomplishingthis, which may readily and cheaply be applied to looms of the ordinaryconstruction.

In the accompanying drawings,Figure 1 represents in section the cloth-beam and two warp-beams of a'loom, the warps and woven fabric and theessential parts of my mechanism being shown in position. The remainder:of the loom is entirely omitted, not being necessary to anunderstanding of my invention. Fig. 2 shows portions of thefrictionrollers A B, Fig. 1, and part of one of their supports on alarger scale as viewed from the back of the loom. Figs. 3,4, 5, and 6show detail parts.

Grinkles is the-name commonly given to a cotton fabric having stripeswhich are alternately smooth and wrinkled or erinkled. This crinkling isobtained by weaving the fabric with two warps and causing thewarp-threads which form the crinkled stripes to be let off faster thanthe warp of the rest of the fabric.

E, Fig. 1, is the plain warp-beam.

h is the cloth--beam, and O is asecond warpbeam containing the warpwhich is to form the crinkled part of the fabric.

It is necessary that the warps from the beam 0 should be deliveredsomewhat faster than those from beam E.

My invention consists of simple mechanism very easily attached to anordinary loom, by which the feed of the warps from the beam 0 can beregulated and varied in accordance with any desired pattern by the useof a patternchain.

The plain warp from the beam E passes over the rod H and through theheddles in the usual manner. The rest of the warpfrom the beam 0. beforepassing under the rod I, describes a sigmoid curve around the rollers A1-3. These rollers are quite heavy,and the upper one rests with all itsweight upon the lower,for its axle does not rest in bearings,but playswithin the slots formed by the U-shaped projections m upon the inside ofthe part of the frame Z, which carries the lower roller, A. The surfaceof these rollers is covered with a rough cloth. The result is that thereis suffieient friction for the revolution of A to impart a correspondingmotion to B, and also to firmly control the warp which passes aroundthem, so that the motion of the warp from the beam 0 is absolutelydependent upon the motion of the roller A. This motion is obtained by awormgear, A", at the end of the roller A engaging with an endless screw,9, upon the shaft 9, which passes th rough the block it, fastened to theframe of the loom, and carries the ratchet-wheel f. This wheel iscontrolled in the usual way by the holding-ratchet h and the act-uating-pawl 6. This latter is fastened to the plate (Z, which rotates uponthe axis of the shaft 9 in accordance with the motion of the rod to,which has free vertical play. Attached to the rod near its lower end isa finger, Z), secured in any desired position by a thumb-screw, 0*.

D is the main shalt of the loom. It carries the cam c. The finger is soadjusted as to be raised by the revolution of this cam, and, accordingas it is set higher or lower upon the 'rod,the amount of motion of therod will vary and with it the revolution of the plate d, andconsequently the number ofdents of theratchet which are passed over eachtime by the pawl (2; hence the motion of the roller A, and therefore ofthe warp from the beam 0, is varied at will by placing the finger bhigher or lower upon the rod o. If it is raised above a certain point,there will be no let-off motion at all.

YVhen it is desired that the 1etoff motion shall be constant, this isall that is required. W hen it is desired that it shall vary accordingto a pattern, a pattern-chain must be used. This is shown in position atM, Fig. 1. It is carried by a shaft,K, which obtains its motion by achain-belt, K, either from the main shaft or from any convenient part ofthe loom, in

accordance with the rapidity of rotation desired. The bobs or risers ofthis patternehain play against the projecting end of the finger b. \Vhenthey raise it, the amount of motion given to it by the cam c isdecreased or reduced to nothingaecording to the size of the riser. Theymay be thus made to produce a stripe alternately wrinkled and smooth.

Having thus described my invention, I claim 1. The combination of thewarp-beam (J, the friction-rollers A B,ithe rod 1 geared to one of themby an endless screw and cog, the ratchet-wheelf upon said rod, theoscillating plate d, having a pawl engaging the ratchet-wheel, 15 therod a, the adjustable finger Z) upon said rod, and the cam c.

2. The combination of the warp-beam G,the friction-rollers A I the' rod9, geared to one of them by an endless screwand cog, the ratchet-wheel fupon said rod, the oscillating plate (I, having a pawl engaging theratchet-wheel, the rod to, the adjustable finger b upon said rod, theeamc, and the pattern-chain M.

Witnesses:

A than!) S. Ml 1.1.nn, J. H. Bnnl,

